Flight crew of a fokker 100, FK10, made an emergency descent after a flight data unit displayed a cabin altitude climbing alert message. The quick response descent leveled off the cabin before causing the passenger masks to drop and the cabin altitude stabilized for further descent and landing.

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Attributes
ACN	413962
Time
Date	199809
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : slp
State Reference	FO
Altitude	msl bound lower : 35000 msl bound upper : 35000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : mmex
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	413962
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
ASRS Report	413963
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	faa : investigated Other
Supplementary
Primary Problem	Aircraft

Narrative:

At FL350 shortly before starting descent for landing, cabin altitude alert on MFDU display. Cabin altitude was climbing through 10000 ft. Performed emergency descent per checklist. Cabin altitude climbed to approximately 12000 ft as we descended. As we got down to lower altitude, cabin stabilized and pressure operated normally through landing. The cabin oxygen masks did not deploy and landing was normal.

Original NASA ASRS Text

Title: FLC OF A FOKKER 100, FK10, MADE AN EMER DSCNT AFTER A FLT DATA UNIT DISPLAYED A CABIN ALT CLBING ALERT MESSAGE. THE QUICK RESPONSE DSCNT LEVELED OFF THE CABIN BEFORE CAUSING THE PAX MASKS TO DROP AND THE CABIN ALT STABILIZED FOR FURTHER DSCNT AND LNDG.

Narrative: AT FL350 SHORTLY BEFORE STARTING DSCNT FOR LNDG, CABIN ALT ALERT ON MFDU DISPLAY. CABIN ALT WAS CLBING THROUGH 10000 FT. PERFORMED EMER DSCNT PER CHKLIST. CABIN ALT CLBED TO APPROX 12000 FT AS WE DSNDED. AS WE GOT DOWN TO LOWER ALT, CABIN STABILIZED AND PRESSURE OPERATED NORMALLY THROUGH LNDG. THE CABIN OXYGEN MASKS DID NOT DEPLOY AND LNDG WAS NORMAL.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.